The evolution to hepta-refractory myeloma involves sequential loss of CD38, BCMA and GPRC5D. - Riedhammer C; Truger M; Lee H; Leypoldt LB; Meggendorfer M; Hutter S; Müller H; Mersi J; Kadel SK; Buchwald T; Kosch R; Helal M; et al. (Leukemia, 2026)